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POWER ROCK DRLL.

No. 316,106. Patented Ap1n`21, 1885.

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POWER. ROCK DRILL.

No. 316,106. Patented A131221, 1885.

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, UNITED STATES PATENT OFFICE.

CHARLES O. BARLOW AND GEORGE T. EMERY, OF NEVADA CITY, CALIFOR- NIA,v ASSIGNORS, BY-DIREOT AND MESNE ASSIGNMENTS, OF ONE-HALF TO JOSEPH W. SPRAGUE, OF SAME PLACE, AND RICHARD H. LANE, OF

New YORK, N. Y.

POWER ROCK-DRILL.

SPECIFICATION forming part of Letters Patent-N0. 316,106, dated April 21, 1885.

-Applicaiion filed January 14, 1884. (No model.) i

To all whom, it may concern: i Be it known that we, CHARLES O. BARLOW and GEORGE CREMERY, of Nevada City, in the county of Nevada and State of California, 5 have invented an Improvement in Power Rock-Drills; and we do hereby declare the following to be a full, clear, and exact descrip-` tion thereof.

Our invention relates to the class of power 1o rock-drills inwhich a column supports a crossbar on which is suspended the body of the machine carrying the drill, the hammer, and means for vibrating the hammer and rotating the drill; and our invention more particularly relates to certain new and useful improvements in that machine of this class for which we applied for Letters Patent of the United States February 27, 1883, and the application for which was allowed October 19, 1883.

Our improvements consist in a steam-engine as a source of power formed with and carried by the body-bar of the machine and connected with the driving-shaft which operates the hammer; in novel mechanism for vibrat- 2'5 ing the hammer, a peculiar drill and mechanism for rotating it, and means for introducing a continuous supply of water near the bottom 'of the hole to wash out the pulp, all of which we shall hereinafter fully explain, reference y 3o being made to the accompanying drawings, in

which- Figure 1 is a perspective view of our power rock-drill. Fig. 2 is a side elevation, portions of the cross-bar being broken away in order 3 5 to show feed-screw C and chuck E. Fig. 3 is a horizontal section taken on the plane of the axis of shaft H.

The object of our invention will be made known in the course of the description.

A is the supporting-column provided at top and bottom with obvious devices for taking hold of the timbers or walls of the shaft or tunnel. B is the cross-bar secured to said column by a boxing, a, which We have fully described in our previous specification, and

which need herein be simply indicated. By

means of this connection the cross-bar is adapted to be adjusted vertically and to any desired inclination.

' D is the body-bar provided with across- 5o head, d, by which it is suspended from and is adapted to slide upon the cross-bar B. This movement we herein accomplish by means of a feed-screw, C. Cast with said body-bar and its cross-head is a steam-cylinder, W, having 5 5 a'steam-chest, X, a steam-pipe, w, and an exhaust, x. It is provided with a piston, of which u is the pitman, and with a valve, of which o is the rod.

This engine is of a common form, taking 6o steam at one end only, the novelty in this connection being merely its union with the bodybar and its connection with the driving mechanism, whereby it becomes part of the machine itself and is carried with it.

' Mounted in the lower end of the body-bar D is the main driving-shaft H, with which the pitman u of the engine is connected by a crank,

r, and with which the valve-rod o is connected by a small return-crank, r', whereby said shaft 7o is rotated and the operation ofthe engine continued.

Steam is furnished to the engine from any suitable source through a fiexible tube, (not here shown,) whereby the drill may be moved about.`

' In the top of body-bar D is fitted the drillholding spindle or arbor e, having the chuck E on its forward end and a cushions'pring, g.

F is the drill inserted in the chuck.

In the lower end of the body-bar Dis pivoted the hammer-head I, in which is secured the hammer-handlej of the hammer J, which in its vibration is adapted to deliver a blow on the head of the drill-arbor e. Extending up- 8 5 ward from said hammer-head is an arm,Y, in the top of which is pivoted a downwardly-extending arm, Y', between the lower end of which and the Yhammer-head is a cushionspring, y. Pivoted to the upper end of arm 9o Y is a rod, Z, which extends forward through the body-bar loosely, and has a nut, z, threaded on its end. Around this rod, between its nut and the body-bar is a spring, K.

Upon the shaft H is a modified eccentric, G, of the shape shown in Fig. 2, and consisting of a disk, one portion of the circumference of which is formed on a radius so much greater than the rest of .it that in its rapid revolution it has somewhat the effect of a cam with an abrupt fall in its circumference without producing the jar of such a cam.

In the lower end of the arm Y is a roller, Z, which is held at all times against the eccentric G by the spring K. If the eccentric is revolved v slowly, its only effect is to press the hammer to the hammer-head produced rapidV jars or blows, generating vibration in the handle, which .increased -until it broke; but in the 'present case the roller, being always against the eccentric, and cushioned on the head I is not subjected to jar, and therefore cannot transmit it to the hammer-handle, the life of which is thereby materially increased. .'Ihe vspring K, -being compressed on the rod Z,keeps the roller against the eccentric, and of course draws forwardthe hammer to deliver its blow. By setting up the nut e the tension of the spring is regulated. 1

rIhe means for communicating a positive r0- tation to the drill are as follows: In a side arm, d', of body-bar D is journaled a shaft, M, upon lwhich is a gear-wheel, m, which meshes with aworm, N, on the main shaft. H, Figs. 2, 3. Upon the end of shaft M is a chain-pulley, O, and upon the rear end of the drill-arbor c is another chain-pulley, I?. Between these pulleys extends an endless chain, p.v yBy these vmeans a positive and continuous rotation is given the drill.

.Qisaflexible tube communicating'witha suitable source of water,(not here shown,) wherebyit receives water under head orpressure. Its forward end is supported by a `pivoted bearing, R, above the body-bar, and it is provided with a long straight nozzle, q, having a check-cock, g; but wev accomplish 'the result', by means of a continuous supplyl of water under pressure introduced during the operation of drilling near the bottom'of the hole. Weinsert the long nozzleginto the hole with the drill until it reaches a point just behind its lips. It is not interfered with by the drill, as the hole is large enough for both. Thewater passes by the lips and forcesthe pulp back between them, thus keeping the bottom of the hole clear. As the drill advances, the water-nozzle is pushed in farther. The length of the nozzle and its material (preferably brass) enable us to bend it 'sufficiently to 'get it into the hole without having its rear portion in the way of the machine. The three-lip drill is particularly advantageous in uthis connection, as itr affords greater space` for the discharge of the pulp.

' Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. In a rock-drill, the body-bar D, the drillarbor e, swinging hammer-head Land hammer J ,in combination with the modified eccentric G, a yielding surface between said eccentric and hammer-holder, and a means for holding said surface against the eccentric, substantially as herein described.

2. In a rock-drill, `the body-bar D, drill-arbor c, swinging hammer-head I, andvhammer J in combination with the modified eccentric G, arm Y on the hammer head, `swinging arm Y', pivotedin said arm, and having the, roller Z impinging on the eccentric, the cushion, y between said arms, the rod Z, connected with the swinging arm Y, and spring K on the rod, all arranged and operating substantially as herein described.A

\ 3. In a rock-drill, thel sliding` body-bar D, the drill F, and arbor e, with which it is connected, in combination with the vibrating hammer J, shaft H, and intermediate devices for operating the hammer, the worm N on shaft H, shaft M, gear m, chain-pulley O lon said shaft M, chain-pulley P on the drill-arbor e, and Vthe endless chain p, all arranged .and operating substantially as and for the purl pose described.

' In witness whereof we havehereu nto set our hands.

.. CHARLES O. BARLOVV'.l l GEORGE T. EMERY.v f f Witnesses: Y t g W. D. LONG,

T, D. GLEARMAN. 

